I don't wash sticky chicks unless there is some impairment in their movement because of it. i.e. they can't move a wing, leg, head, or poop. If they are just sticky I let them do it naturally. You can lose a bantam chick quickly if it gets too cold.
If you decide to wash it do make sure it never gets chilled.
I never wash my chicks..take an old but clean toothbrush and gently brush the little fella.It will loosen all the glue and they will fluff right up.Saves them from being wet. If the glue still wont come off dampen the toothbrush just a little.